Optimum Nutrition Nitric Boost is for anyone who wishes to extend their muscle pump, signal muscle growth, speed recovery, increase their strength, stamina and sexual vigor. Nitric Oxide, a key molecule manufactured by the body, causes vasodilation (an expansion of the internal diameter of blood vessels), which in turn leads to increased blood flow, oxygen transport, delivery of nutrients to skeletal muscle and a reduction in blood pressure. An amino acid compound called arginine alpha-ketoglutarate (A-AKG) and arginine-ketoisocaproate (A-KIC) can boost short term Nitric Oxide levels. Increased strength and markedly improved stamina can also be expected.